.wrap {
    padding: 20px 50px;
}

#addStudent {
    float: right;
}

body {
    width: 100%;
    height: 100%;
}

#template {
    display: none;
}


/* 弹出层 */

#mask {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    display: none;
}

#pop {
    width: 600px;
    padding: 20px 50px;
    background-color: white;
    position: fixed;
    left: 50%;
    top: 50%;
    border-radius: 10px;
    transform: translate(-50%, -50%);
    display: none;
}